Internal grinding fixture



Dec. 8, 193.6. c. BooTH Er A1. l y IVNTERNLRIND-LNG FIXTURE Filed May 31, 19.55 3 Sheets-.Sheet l Izq 7 4 i 1;/ 2, l@ in ATTORNEY.

De.s,19a6.` C BOOTH'ETAL 2,063,659

` INTERNAL GRINDNG FIXTURE ATTORNEY.

Dec. s, 1936. y c. Boom -r A.. V2,063,659

INTERNAL GRINDING FIXTURE Filed May 31, 1955 3 Sheets-Sheet y.'5

ATTORNEY.

Patented Dec. 8, 1936 y UNITED vSTATES PATENT y lOFFICE:

2,063,659 INTERNAL GRINDING FIXTURE Clement Booth, Cincinnati, and John E. Caster,

Willoughby, Ohio, assignors to Cincinnati Grinders Incorporated, Cincinnati, Ohio, a corporation of Ohio v Application May 31, l1935, Serial No. 24,286 i 9 Claims. (Cl. 51-3) This invention relates to grinding machines grinding wheel may be secured to the end of a and more particularly to attachments therefor. spindle I which is journaled in a bearing hous- One of the objects of this invention is to proing I6 formed in a housing I1 carried by a cross vide a grinding machine in which internal and slide I8 whereby the wheel may be adjusted rela- 5 external grinding operations may be carried out tive to the work carried by the table. 5 without changing the set-up of a work piece. The housing I1 may be pivotally mounted for Another object of this invention is to provide rotation about a pin I9 carried by the cross slide an improved internal grinding attachment for I8 whereby the axis of thegrinding wheel may cylindrical grinding machines. be angularly adjusted with respect to the axis of i0 A further object of this invention is to provide reciprocation of the table which facilitates ad- 10 an internal grinding attachment which may be justment of the parts for grinding tapered surdetachably applied to cylindrical grinding mafaces. chines and in which, even when applied, the in- The grinding wheel may be driven by a prime ternal grinding wheel may be oscillated out of mover 20 mounted directly on the housing I1 working position so that the machine may be and having a pulley 2| on one end in alignment 15 utilized for cylindrical grinding purposes withwith a pulley 22 mounted on the end of spindle out interference by said attachment. I5 opposite to the grinding wheel. 'I'hese pulleys An additional object of this invention is to may be connected by a plurality of V-belts 23 provide an internal grinding attachment which as shown in Figure 5. is applicable to a cylindrical grinding machine 'I'he pulley2I maybe supported on anti-friction 20 in such a manner that the same in-feeding mechbearings 24 carried by the end of the motor shaft anism for the grinding wheel and the saine 25, the anti-friction bearings supporting the pultraversing mechanism for the table may be utilley for free rotation with respect to the shaft. ized with the internal grinding wheel. The end of the shaft has a bore 26 in which is Other objects and advantages of the present slidable a plunger 21 having a cross pin 28, the 25 invention will be readily apparent by reference ends of which project through diametrically opto the following specification considered in conposite slots 29 formed in the shaft 25 into enjunction with the. accompanying drawings illusgagement with a shiftable clutch member 30. Y trative of one embodiment thereof, but' it will The end of plunger 21 has a hand wheel 3| and 30 be understood that any modifications may be a plurality of grooves 32 engageable by spring 30 made in the specific structural details within the pressed balls 33 which constitute means for shiftscope of the appended claims without departing ing the clutch member 38 into and out of engagefrom or exceeding the spirit of the invention. ment with clutch teeth 34 formed on one face Referring to the drawings in which like referof the pulley 2| and holding the parts in either 35 ence numerals indicate like or similar parts: j position. 'I'his constitutes a start and stop clutch 35 Figure 1 is a front elevation of a'machine emfor the grinding wheel I4. bodying the principles of this invention. The table may be reciprocated by power means Figure 2 is a plan view oi the machine shown comprising a prime mover '35 which may be in Figure 1. mounted in a convenient place in the bed of the Figure 3 is a sectional View taken on the line machine and connected through rate change gear- 40 3-3 of Figure 1. ing and reversing mechanism to the table. Figure 4 is a sectional view taken on the line This mechanism is more particularly shown in 4 4 of Figure 1, Figure 8 and comprises a drive shaft 36 which is Figure 5 is a detailed section taken on the line connected by a chain and sprocket mechanism 5-5 of Figure 2. indicated generally by the reference numeral 31 45 Figure 6 is a diagrammatic view of the power to the prime mover 35. A start and stop friction traversing mechanism for the table. clutch 38 may also be provided for connecting Figure 7 is a modified form of the invention. and disconnecting the prime mover with shaft 36. In Figure 1 of the drawings there is shown a The shaft 36 extends into a rate change box plain cylindrical grinding machine comprising a 39 and has a shiftable gear unit 40 splined there- 50 bed Ill having guideways formed on the top thereon comprising gears 4 I, 42 and 43 selectively shiftof for receiving a reciprocating table II which able into mesh with gears 44, 45 and 4,6, the may be provided with a headstock I2 and a taillatter being carried by shaft 41. The shaft 41 stock I3 for supporting a work piece in operative also has a shiftable gear unit 48 comprising gears relation t0 an external grinding wheel I4, This 4 9, 50 and 5I selectively shiftable into mesh lwith 55 gears 52, 53 and 54 mounted on shaft 36. By means of these two shiftable gear units, the shaft 41 may be rotated at any one of siX different speeds by the prime mover. The rate change unit 39 may be mounted in a convenient relation to the prime mover at the rear of the machine and connected to a shaft 55 journaled in the front of the machine in parallel relation to shaft 41 by means of an intermediate shaft 56 Which is connected at one end by bevel gearing 51 to the shaft 41, and at the other end by bevel gearing 58 to shaft 55. The final bevel gear 59 of the gearing 58 is actually mounted for free rotation on the shaft 55 'and has integral therewith a spur gear 60 and clutch teeth 6| formed on the face of the spur gear. The shaft 55 has a shiftable gear 62 mounted thereon which has clutch teeth 63 on one face for engagement with clutch teeth 6| whereby the bevel gear 59 may be directly connected to shaft 55 for rotation thereof. A

The gear 52 is also shiftable into mesh with a gear 60 of couplet B5 which has a relatively large gear 65 intermeshing with the relatively small gear 60whereby when this connection is made the shaft 55 is rotated at a relatively slow speed compared toits speed of rotation when directly connected to gear 59. 'I'he shiftable member 62 may thus be termed a feed rapid traverse selector because when in one position the shaft 55 is rotated at a slow or feeding rate, and when in the other position `the shaft is rotated at a relatively fast or quick traverse rate.

The shaft 55 also has mounted thereon for free rotation a pair of bevel gears 61 and 58 which have clutch teeth 89 and 10 formed on opposite faces thereof and selectively interengageable with clutch teeth formed on opposite faces of the shiftable reverser clutch member 1|. The bevel gears 61 and 68 inter-mesh with bevel gear 12 selcured to the end of shaft 13 which also has fixed therewith a worm 14 intermeshing with a worm gear 15 fixed to the end of vertical shaft 16.

rI'he shaft 16, as shown in Figure 3, extends upward to the underside of the table where it is provided with a pinion 11 which intermeshes with rack 18 secured to' the underside of the table. The worm gear 15 is actually mounted for free rotation on the shaft 16 and is connectible thereto -by means of clutch teeth 19 formed on one face of the Worm gear, which are interengageable with clutch teeth 80 formed on the shiftable clutch member 8| which is splined on shaft 16.

When the clutch member 8| is shifted by its operating fork 82 secured to shaft 83 and having an operating handle 84 mounted on the front of the machine, the table is connected with the prime mover for actuation thereby at a plurality of different feed rates or at a rapid traverse rate or in opposite directions.

The clutch member 8| also has clutch teeth 85 formed on the opposite face thereof which are inter-engageable with clutch teeth 86 lformed integral with bevel gear 81 whereby the bevel gear may be connected to shaft 15 and the powerr drive thereto disconnected. This bevel gear is utilized for manual actuation of the table from the rotatable hand wheel 88 which is secured to the end of shaft 89 and connected by the bevel pinion 90 to bevel gear 81.

There has thus been provided power operable and manually operable means -for traiversing the table and a selector has been provided for determining the manner of operation. Since the reverser clutch 1| does not have a neutral position, the clutch 8| may also be moved to a third or intermediate position for disconnecting both drives from the table and it therefore serves as a stop clutch for the power drive.

The cross slide I8 may be moved toward and from the table by means of the following mechanism comprising a rack 9| securedto the cross slide, and a spur gear 92 intermeshing therewith, the spur gear being keyed to the end of a vertical shaft 93 which is journaled in the bed of the machine. The shaft 93 is rotated by a worm 94 secured to the end of shaft 95 and an intermeshing Worm gear 96 keyed to the end of shaft 93. 'I'he shaft 95 extends through the front wall of the bed and is provided with a manually operating hand wheel 91. This shaft also has a pick-feed wheel 98 keyed thereto whereby the grindingv wheel may be automatically fed toward the table at the end of each reciprocation thereof.

The following mechanism is utilized for operating the reverser and actuating the pick feed mechanism. A shift lever 99 is pivotally mounted at on the front of the machine and has an integral depending arm |0| to the end of which is pivotally connected a horizontally reciprocable member |02 having a lost motion connection with the shifter member |03 of the reverser clutch 1|. A rod |04 extends to opposite sides of the member |02 for connection to any well known form of load and fire mechanism, not shown, for completing the movement of the reverser clutch and which is operable in such a manner as to prevent this clutch from being shifted to a central or non-power transmitting position.

The member 99 is adapted to be alternately engaged by dogs and |06 mounted in the usual manner in T-slots on the forward edge of the table.

The lever 99 also has a second lever |01 integral therewith which has a beveled end which engages a roller |08 rotatably mounted in one end of a bell crank |09. The bell crank is operatively connected to a vertically reciprocable plunger ||0 in the end of which is pivotally mounted a pick feed pawl lever lll. When the lever 99 is rotated counter-clockwise, as viewed in Figure 1, the arm |01 moves in such a direction as to rotate the bell crank |09 in a clock- Wise' direction and thereby depress the plunger ||0 against the resistance of a spring ||2 interposed between the lower end thereof and the frame of the machine. 'I'his positively actuates the pick feed pawl lever in such a direction as to cause rotation of the shaft 95.

When the lever 99 is moved in a clockwise direction the spring ||2 returns the plunger |I0 in a vertical direction whereby the pick feed pawl lever will obtain a new grip on the pick feed wheel 98. 'I'hus the pick feed mechanism is operated once for each reciprocation of the table and simultaneously with the reversal thereof.

As shown in Figures 3l and 4, a bracket ||3 is provided for detachable connection to the top of the bearing housing I6 Ias by means of screws ||4 for supporting an internal grinding Wheel. 'I'his bracket has a pair of bosses ||5 and ||6 through which passes a rod ||1 for pivotally supporting a swinging arm ||8 on the end of which is formed a spindle housing I I9.. A spindle |20 is journaled in this housing and has means for detachably supporting an internal grinding wheel l |2|. This spindle also has a pulley |22'connected by belt |22 with a pulley |23 supported on an mover 20.

When the arm II8 is swung downward to the position shown in Figure 3, means are provided in the form of .bolts |21 for rigidly securing the arm I|8 in fixed position and thereby holding the grinding wheel I2I in fixed relation to ,the

work. These bolts are slidable in T-slots |28- formed in the housing I6 whereby they may be loosened and quickly removed to permit elevation of the arm I I3 to its dash and dot line posi-- tion shown in Figure 4.

It will be noted from Figure 4 that the shaft |24 moves in an arcuate path about the center II1 when the arm ||8 is swung to its upward position. It will also be noted that the shaft |24 moves toward the center of the motor shaft 25, thereby loosening the tension on the belt |28' which interconnects pulleys |26 and |25 for rotation by the prime mover 20. Thus the mere elevation of the arm II8 automatically interrupts the transmission of -power to the internal grinding wheel. f

Since the internal grinding wheel is carried by the housing I1, it will'be noted that the same infeed mechanism for the external grinding wheel |4 may be utilized for feeding the internal grinding wheel laterally into engagement with the work, and since the work can be mounted on the same table and in the same position for internal grinding as for external grinding, the same mechanism is utilized for traversing the work with respect to the internal grinding wheel as is used for traversing the work with respect to the external grinding wheel. It thus follows that with one set-up of the work piece both 1nternal and external surfaces may be ground thereon, thus insuring that these. surfaces are concentric withone another.

For internal grinding operations, the work piece such as |29 is supported in a chuck |30 which may be secured to the face plate I3I, the latter being adapted to be rotated by a prime mover |32 carried by the headstock.

In Figure '7, a modified form of the invention is shown in which a separate electric motor |33 is mounted directly on the detachable bracket and the belt |22', which drives the internal grinding wheel, now passes around the motor pulley |34. The motor may be mounted with its axis concentric with the axis of the pivot shaft I I1 so that the belt will not loosen`when the arm is raised as it is not necessary withv this arrangement to loosen or remove the belt to stop the internal grinding wheel. l

If plain cylindrical grinding operations are to be performed, the work may be mounted between centers carried by the headstock and tailstock andthe internal grinding attachment may be retracted to its dash and dot line position shown in Figure 4 and the cylindrical grinding operation carried out without interference therefrom.

There has thus been provided an improved grinding machine for the purposes aforesaid in which both internal and external grinding operations may be carried out to produce surfaces concentric with one another and in which the internal grinding wheel may be retracted from working positon, thereby conditioning the machine for performing. external cylindrical operations without interference therefrom.

What is claimed is:

1. In a grinding machine having a bed, a work table reciprocably mounted upon the bed, and a spindle housing adjacent the bed, the combination of means for supporting an internal grinding wheel comprising a bracket attached to said housing, a swinging arm pivotally mounted on said bracket, a spindle journaled in the end of said arm and carrying an internal grinding wheel, means to limit the swinging movement of said arm in one direction to position the internal grinding wheel in a working position relative to the -work support, and means to positively secure said arm to said housing whereby said internal grinding wheel will be positively held while in a working position.

2. In a grinding machine having a support, a work table reciprocably mounted upon the sup,- port and a grinding wheelhousing movable toward and from the work support, the combination of means for supporting another grinding wheel in operative relation to the work support including a bracket detachably mounted on the housing, a arm pivotally mounted on the bracket, a grinding wheel spindle journaled in the end of the arm, a power shaft located on the side of the pivotopposite to the grinding wheel spindle, pulleys on the power shaft and spindle, an idler shaft journaled in the arm adjacent to the lpivot for movement thereabout upon movement of the arm, a first pulley mounted on the idler shaft and operatively connected to the pulleyon the spindle, a second pulley mounted on the idler shaft and connected by power transmitting band to the pulley on the power shaft, said idler shaft being movable in a first direction upon movement of the arm to a working position to cause tightening of the power belt, and in a second direction to loosen the power belt and disconnect the drive to the grinding wheel.

3. In a grinding machine having a reciprocable work table, means thereon for rotating a work piece and a cross slide movable toward and from the work table, the combination of a prime mover mounted on said cross slide, a housing carried by the slide, a grinding wheel spindle journaled in the housing and having a driving pulley attached thereto, an internal grinding attachment secured to said housing and including a driving pulley, said prime mover consisting of an electric motor having an armature shaft projecting at opposite ends thereof, means secured to one end of said shaft and lying in the plane of one of said drive pulleys for actuation of one grinding wheel, means secured to the opposite end of said armature shaft and lying yin the plane of the other pulley for actuation of the internal grinding attachment.

4. In agrinding machine, the combination with a reciprocable work table having means for rotatably supporting a work piece, the combination with a slide movable toward and from the table and having a grinding wheel journaled therein, of a bracket detachably mounted on the slide, a power shaft carried by the bracket, an arm pivotally mounted on the bracket and having an internal grinding wheel spindle journaled in the free end thereof and motion transmitting means coupling the power shaft to said spindle.

5. In a grinding machine, the combination with a reciprocable table, and a slide movable toward and from the table having an external grinding wheel spindle journaled therein, of a bracket detachably mounted on the slide, an arm pivotally mounted on said bracket and having an internal grinding wheel spindle journaled in the free end of the arm for positioning an internal grinding Wheel in al working position with respect to said table, a motor carried by said bracket with`its axis coaxial with the pivot axis of the arm, motion transmitting connections coupling the motor for rotation of said internal grinding wheel spindle, and means for locking the arm to the slide independently of the connection of the bracket thereto.

6. The combination with the wheel head unit of an external grinding machine having a pair of angularly related seats formed thereon, of an internal grinding attachment Pfor Aapplication thereto including a bracket portion, meansl to secure the bracket portion in interengaging relation with one of said seats, a pivot carried by the bracket portion, an arm oscillatable on the pivot,

said arm being formed with a seat for interengagement with the other seat of the wheel head when in one position of adjustment about its pivot, a supplemental grinding wheel spindle journaled in the arm, and means for securing the arm to the wheel head 'with their seats interengaged whereby the spindle will be rigidly supported in definite position relative to the Wheel head.

7. The combination with the wheel head unit of an external grinding machine having a pair of angularly related seats formed thereon, of an internal grinding attachment for application thereto including a bracket portion, means to secure the bracketpoiton in interengaging relation with one of said seats, a pivot carried by the bracket portion, an arm oscillatable on the pivot, said arm beingformed with a seat for interengagement with the other seat of the wheel head when in one position of adjustment about its pivot, 'a supplemental grinding wheel spindle journaled in the arm, means for securing the arm to the wheel head with their seats interengaged whereby the spindle will be rigidly supported in deiinite position relative to the wheel head, a prime mover supported on said wheel head, and driving connections between the prime mover and spindle operative to etect rotation of the spindle-When the arm is secured in operative position.

8. An internal grinding attachment for application to the wheel head of a cylindrical grinding machine including a. bracket portion for attachment to the machine, an arm mounted on the bracket for oscillatory movement relative thereto intol and out of operative engagement, said arm being formed with an attaching portion remote from its connection with the bracket for direct engagement with the wheel head, means for securing said portion of the arm direct to the wheel head to maintain the arm in definite position with respect thereto, an internal grinding spindle journaled in the arm, a power transmitting member carried by the arm in eccentric relation to its oscillatable connection with the bracket, and a prime mover coupled with the spindle of the arm by way of said power transmitting device whereby oscillation of the arm about its pivot into operative grinding position will eiect positive driving connection of the prime mover and spindle and the securing of the arm to the wheel head will maintain the parts in proper power transmitting relationship.

9. In mechanism of the character described, the combination with the wheel head, of an eX- ternal cylindrical grinder including a grinding wheel spindle journaled thereon, of an auxiliary attachment therefor including a bracket applicable to the wheel head, means for securing the bracket to the wheel head, an arm pivoted to the bracket, an auxiliary grinding wheel spindle carried by the arm, means for securing the arm in one pivotal adjusted position direct to the wheel head, a prime mover carried by the Wheel head, a first series of power transmitting connections from the prime mover to the first wheel spindle, a second series of driving connections from the prime mover to the second spindle, and independent means for determining the ineffectiveness of such connections as respects the individual spindles.

CLEMENT BOOTH. JOHN E. CASTER. 

